The War Doctor considered a special incarnation of The Doctor in the modern Doctor Who.
Originally young and robust, the War Doctor set upon the warrior path for which he had been intended, and disavowed the name of "the Doctor". Though the Time Lords and Daleks continued to refer to him by that name, he was also referred to as "the Renegade" by Lady Priyan and "the Warrior" by Clara Oswald. After becoming old and tired of battle and faced with the end of reality, the Doctor considered activating the Time Lord doomsday weapon called The Moment, to finally end the Time War by committing genocide against both the Daleks and his own people. However, the Moment's sentient interface led him down a different path by letting him view his future first-hand. By teaming up with both the Tenth Doctor and the Eleventh Doctor, his mind was opened to a possible way to stop the Time War and save Gallifrey, using all 13 Doctors to help him to freeze it in a pocket universe.
Like the First Doctor, he died simply due to his old age, and regenerated into the Ninth Doctor. Due to his time-stream being out-of-sync thanks to sharing his final adventure with two of his later incarnations, he lost his memories of many of the events they'd experienced together, which lead him to incorrectly believe that he'd used The Moment to destroy Gallifrey and his own people with it.
- He rejected the name of The Doctor, but is considered an incarnation.